 There are many interesting places you should be sure to see . One problem is transportation , however . Because the city is very old , the roads are narrow and congested . If you only have three or four days to visit , you don't want to spend them waiting in traffic in a cab . I suggest you take the subway . 
 The subway ? But is there a subway station next to my hotel ? I have to go between the conference center and the hotel several times a day ... 